Film guide channel for sprocketless cinematographic device

Claim 2

Film guide means for a sprocketless cinematographic device having a film path, a film gate in the film path, and means for engaging the film at a location in the gate to intermittently effect movement of the film through the gate and along the film path in a film advancing direction, the film guide means comprising: means in the gate adjacent one side of the film path adapted to be engaged by the film for locating the film relative to the gate in a direction normal to the film advancing direction; pressure means in the gate having a portion adjacent the opposite side of the film path movable into engagement with the film at a location along the film path beyond the film advancing means in the film advancing direction; and means for biasing said portion of the pressure means (1) into the film path and toward said locating means in response to the presence of film in a location where the film will be engaged by the film advancing means and (2) out of the film path and away from said locating means in response to the absence of film at the location where the film will be engaged by the film advancing means, thereby to bias the film toward the locating means when the film is being advanced through the gate by the film advancing means and to release the bias on the film after the film passes the film advancing means in the film advancing direction.

Claim 3

Film guide means for guiding film having two edges in a sprocketless cinematographic device, the device including means defining a film path having two edges, a gate in the film path having first and second opposed siDe plates and defining an aperture, and film advancing means for engaging and intermittently advancing the film in a film advancing direction along the film path and past the aperture, said guide means comprising: means in the gate adjacent one edge of the film path and adapted to be engaged by one edge of the film to locate the edge relative to the aperture; resilient means in the gate adjacent the other edge of the film path and having a portion adapted to engage the other edge of the film at a location beyond the film advancing means in the film advancing direction; and means for biasing said portion of the resilient means into the film path when the film is in a position to be engaged by the film advancing means and out of the film path when the film is not in a position to be engaged by the film advancing means, thereby to bias the film toward the locating means when the film is being advanced through the gate by the film advancing means and to release the bias on the film after the film passes beyond the film advancing means in the film advancing direction.

Claim 4

Film guide means for guiding film having two edges in a sprocketless cinematographic device, the device including means defining a film path having two edges, a gate in the film path having first and second opposed siDe plates and defining an aperture, and film advancing means for engaging and intermittently advancing the film in a film advancing direction along the film path and past the aperture, said guide means comprising: means in the gate adjacent one edge of the film path and adapted to be engaged by one edge of the film to locate the edge relative to the aperture; resilient means in the gate adjacent the other edge of the film path and having a portion adapted to engage the other edge of the film at a location beyond the film advancing means in the film advancing direction; and means for biasing said portion of the resilient means into the film path when the film is in a position to be engaged by the film advancing means and out of the film path when the film is not in a position to be engaged by the film advancing means, thereby to bias the film toward the locating means when the film is being advanced through the gate by the film advancing means and to release the bias on the film after the film passes beyond the film advancing means in the film advancing direction.

Claim 5

A film guide channel for guiding film having two edges in a sprocketless cinematographic device including a gate defining a portion of a film path having two edges and a film advancing means for engaging and intermittently advancing the film through the gate in a film advancing direction, the film guide channel comprising: first means in the gate defining one edge of the film path and adapted to be engaged by one edge of the film to locate the edge relative to the gate; second means in the gate positioned adjacent the other edge of the film path, having a first pressure portion adapted to engage the other edge of the film at a location adjacent the film advancing means and a second pressure portion adapted to engage the other edge of the film at a location below the film advancing means in the film advancing direction; and means responsive to the presence of film adjacent the film advancing means for biasing said first and second pressure portions into the film path when the film is in a position to be engaged by the film advancing means and for biasing said first pressure portion into the film path and said second pressure portion out of the film path when the film is not in a position to be engaged by the film advancing means, thereby facilitating withdrawal of the film from the gate after the film is advanced beyond the film advancing means along the film path in the film advancing direction.

Claim 6

A film guide channel for guiding film having two edges in a sprocketless cinematographic device including a gate defining a portion of a film path having two edges and a film advancing means for engaging and intermittently advancing the film through the gate in a film advancing direction, the film guide channel comprising: first means in the gate defining one edge of the film path and adapted to be engaged by one edge of the film to locate the edge relative to the gate; second means in the gate positioned adjacent the other edge of the film path, having a first pressure portion adapted to engage the other edge of the film at a location adjacent the film advancing means and a second pressure portion adapted to engage the other edge of the film at a location below the film advancing means in the film advancing direction; and means responsive to the presence of film adjacent the film advancing means for biasing said first and second pressure portions into the film path when the film is in a position to be engaged by the film advancing means and for biasing said first pressure portion into the film path and said second pressure portion out of the film path when the film is not in a position to be engaged by the film advancing means, thereby facilitating withdrawal of the film from the gate after the film is advanced beyond the film advancing means along the film path in the film advancing direction.

Claim 7

A film guide channel in a sprocketless cinematographic device including a gate defining a film path having two edges and a film advancing means for engaging and intermittently advancing film having two edges in a film advancing direction through the gate, comprising: means in the gate defining one edge of the film path and adapted to be engaged by one edge of the film for locating the edge relative to the gate; a pressure member mounted on the device for displacement toward the locating means and for pivotal movement with respect to the locating means and having first and second spaced pressure portions adapted to engage the other edge of the film, respectively, at locations adjacent the film advancing means and below the film advancing means in the film advancing direction; said pressure member being movable to a first position wherein said first and second pressure portions project into the film path to engage the other edge of the film and a second position wherein said first pressure portion projects into the film path and said second pressure portion is withdrawn from the film path; and means for moving said pressure member toward the first position to urge the film toward said locating means in response to movement of the film to a position where it will be engaged by the film advancing means to align the film in the gate and for moving said member toward said second position in response to movement of the film beyond the position where it will be engaged by the film advancing means, thereby facilitating withdrawal of the film from the gate after the film is advanced along the film path beyond the film advancing means in the film advancing direction.

Claim 8

A film guide channel in a sprocketless cinematographic device including a gate defining a film path having two edges and a film advancing means for engaging and intermittently advancing film having two edges in a film advancing direction through the gate, comprising: means in the gate defining one edge of the film path and adapted to be engaged by one edge of the film for locating the edge relative to the gate; a pressure member mounted on the device for displacement toward the locating means and for pivotal movement with respect to the locating means and having first and second spaced pressure portions adapted to engage the other edge of the film, respectively, at locations adjacent the film advancing means and below the film advancing means in the film advancing direction; said pressure member being movable to a first position wherein said first and second pressure portions project into the film path to engage the other edge of the film and a second position wherein said first pressure portion projects into the film path and said second pressure portion is withdrawn from the film path; and means for moving said pressure member toward the first position to urge the film toward said locating means in response to movement of the film to a position where it will be engaged by the film advancing means to align the film in the gate and for moving said member toward said second position in response to movement of the film beyond the position where it will be engaged by the film advancing means, thereby facilitating withdrawal of the film from the gate after the film is advanced along the film path beyond the film advancing means in the film advancing direction.

Claim 9

A motion picture projector, comprising: supply and takeup reels rotatably mounted on the projector; means defining a film path between said supply and takeup reels and including a projection gate; film advancing means engageable with film for advancing the film relative to the gate; pressure means in the gate and having (1) a first condition wherein the pressure means is positioned with respect to film in the gate to engage the film to locate the film relative to the gate and (2) a second condition wherein the pressure means is positioned with respect to film in the gate so that the film is substantially freely movable relative to said pressure means; means for respectively rotating said supply and takeup reels in directions to wind film thereon, said rotating means being operative to exert a force on film in the gate that is (1) sufficient to pull film through the gate when said pressure means is in its second condition but (2) is insufficient to pull film through the gate when said pressure means is in its first condition; and means for moving said pressure means to its first condition when the film is in a position to be engaged by the film advancing means and to its second condition when the film is not in a position to be engaged by the film advancing means.

Claim 10

A motion picture projector, comprising: supply and takeup reels rotatably mounted on the projector; means defining a film path between said supply and takeup reels and including a projection gate; film advancing means engageable with film for advancing the film relative to the gate; pressure means in the gate and having (1) a first condition wherein the pressure means is positioned with respect to film in the gate to engage the film to locate the film relative to the gate and (2) a second condition wherein the pressure means is positioned with respect to film in the gate so that the film is substantially freely movable relative to said pressure means; means for respectively rotating said supply and takeup reels in directions to wind film thereon, said rotating means being operative to exert a force on film in the gate that is (1) sufficient to pull film through the gate when said pressure means is in its second condition but (2) is insufficient to pull film through the gate when said pressure means is in its first condition; and means for moving said pressure means to its first condition when the film is in a position to be engaged by the film advancing means and to its second condition when the film is not in a position to be engaged by the film advancing means.